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  • Wiley-Blackwell  (62)
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  • 1
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0749-503X
    Keywords: Saccharomyces cerevisiae ; Chromosome V ; Monomeric G-protein ; Rab protein ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A Saccharomyces cerevisiae sequence cloned by serendipity was found to encode a protein that is a new member of the Ypt/Rab monomeric G-protein family. This sequence shows high homology to the yeast genes SEC4 and YPT1 and, like SEC4 and YPT1, is essential for viability. The sequence was localized to chromosome V based upon hybridization to pulse-field gel-separated yeast chromosomes. The sequence has been deposited in the GenBank data library under Accession Number L17070.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The problem of optimizing the prestressing force and the tendon configuration for an indeterminate prestressed structure with prescribed cross-sectional dimensions is formulated in linear programming form, The structure is subjected to multiple load conditions and constraints are related to the structural behaviour and to the tendon configuration.It is shown that the number of behaviour constraints at each point in the structure can be reduced, as they represent parallel hyperplanes in the design space. Necessary conditions for feasible solutions are derived. The method based on transformation of the design variables, is suitable for beams, frames, grids and plates. Its application is illustrated for the case of a prestressed bridge.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Post-source decay matrix-assisted laser desorption ionization (PSD-MALDI) of sodium ion-attached branched oligosaccharides derived from glycoproteins was demonstrated as a method of structure analysis by reflectron time-of-flight (TOF) mass spectrometry. Mono-, di- and triantennary structures were investigated. The fragmentation patterns of these (structurally related) substances as obtained in the positive-ion mode showed characteristic differences correlated with branching sites and linkage positions. Two-bond ring cleavages as known from fast atom bombardment/collision-induced dissociation and IR laser desorption mass spectrometry were also observed. Internal fragment ions formed by up to four consecutive cleavages were obtained with high intensity, allowing the branching structure of complex carbohydrates to be identified. PSD-MALDI of oligosaccharides is characterized by high sensitivity, very good signal-to-noise ratios and high reproducibility of fragmentation patterns and signal intensities.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Grenzflächenpolykondensation von Dialkylzinnhalogeniden mit dem Alkalisalz des 1,1′-Dicarboxykobalticiniumhexafluorphosphats (2) im System Tetrachlorkohlenstoff/ Wasser, wurden Oligo(oxycarbony1-l,1 ′-cobalticendiyl carbonyloxydialkyl (oder diary1)-stannandiylhexafluorphosphate) (3) erhalten.Bei Variation des Halogens und des Alkyl- oder Aryl-Restes steigt die Ausbeute inder Reihenfolge I≈Br 〉 Cl and C6H5— 〉 H2C=CH— 〉(CH3)3CH— 〉 C2H5— 〉H3C(CH2)7 — ≈ C6H5CH2— 〉 CH3Das Hexafluorphosphat-Ion konnte in geeigneten waBrigen Salz-Losungen ausge-tauscht werden, wobei losliche Produkte entstanden.
    Notes: Oligo(oxycarbonyl-1,1′-cobalticendiylcarbonyloxydialkyl (or diaryl)stannanediyl hexafluorophosphate)s (3) were synthesized by condensation of alkali salts of 1,1′-dicarboxycobalticinium hexafluorophosphate (2) with dialkyl (or diaryl) tin dihalides in CCl4/water using the interfacial technique.Variation of the halide and of the alkyl or aryl group causes an increase of the yield in the order I≈Br 〉 Cl and C6H5— 〉 H2C=CH— 〉(CH3)3CH— 〉 C2H5— 〉H3C(CH2)7 — ≈ C6H5CH2— 〉 CH3The polymeric product (3) undergoes an exchange of the hexafluoro phosphate ion in a suitable aqueous salt solution to give soluble products.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The need for multiple repeated analyses, which usually involve much computational effort, is one of the main difficulties in the optimization of large structures. This study deals with approximate structural reanalysis along a line in the design space, a problem common to many optimal design procedures. The problem is first stated in terms of a single independent variable. Explicit polynomial approximations for the nodal displacements are then presented. It is shown that Taylor series expansion of the displacements and a series based on a simple iteration procedure are equivalent. Furthermore, the series coefficients can readily be computed, providing efficient and high-degree polynomial approximations.To improve the quality of the approximations, two nonpolynomial series are proposed. The relationship between the various methods is discussed and simple numerical examples demonstrate applications. All the proposed procedures require only a single exact analysis to obtain the explicit expressions for any given line.The results obtained are very close to the exact solution and indicate that the proposed methods provide efficient and high-quality approximations for the nodal displacements.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In most structural optimization problems the time-consuming implicit analysis must be repeated many times during the solution process. To alleviate this difficulty, the implicit analysis equations are often neglected or replaced by explicit approximations.Assuming the force method analysis formulation, optimal solutions of two problems are studied and compared:(a)The equilibrium linear programme (ELP), where only explicit equilibrium conditions are considered in the analysis model(b)The non-linear programme (NLP), where the implicit compatibility conditions are included to obtain a complete formulation.The effect of geometrical parameters on optimal solutions of both problems is investigated and geometries with particular properties are identified. The main observations that have been made are as follows:(a)Multiple optima of the ELP have been obtained for geometries where transitions in the set of active constraints at the ELP optimum occur. The NLP optimum for such a geometry might be included in the set of ELP optima.(b)Identical optimal solutions of the two problems have been found for geometries where transitions in the set of active constraints at the NLP optimum occur.The explicit ELP can be solved instead of the implicit NLP for the two classes of transition geometries.The relationships between optimal force distributions and objective function values for the two problems are studied and examples where compatibility conditions can be neglected are illustrated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chinaldin wurde mit aromatischen Aldehyden zu 2-Styrylchinolinen kondensiert und diese Kondensationsprodukte zu den entsprechenden Tetrahydroderivaten hydriert. Mit diesen hydrierten Chinolinderivaten wurden N-Substitutionen ausgeführt.Bei der Druckhydrierung von 2-Styrylchinolin wurde nach vollständiger Umsetzung 2-Cyclohexyläthyldekahydrochinolin gewonnen.Die Bromierung und Sulfonierung des 2-β-Phenäthyl-1.2.3.4-tetrahydrochinolins führte zu Substitutionen im Benzolring des hydrierten Chinolinringsystems.Am 2-β-Phenäthyl-1.2.3.4-tetrahydrochinolin-molekül konnte aus sterischen Gründen eine Quaternisierung und am 2-β-Cyclohexyläthyl-dekahydrochinolin-molekül eine N-Alkylierung nicht erzielt werden. Die Zusammenstellung des Molekülmodells aus STUART-Kalotten zeigte, daß die gewinkelte Anordnung der Methylengruppen am C2 in Verbindung mit der großen Raumbeanspruchung der Wasserstoffatome dieser Gruppen auf die Quaternisierung des N-Methylderivates unter sterischer Hinderung einwirken.Infrarotspektroskopisch ließ sich beweisen, daß bei elektrophilen Substitutionen des 2-β-Phenäthyl-1.2.3.4-tetrahydrochinolins die eintretenden Substituenten in den Benzolring zum C5 bzw. zum C6 gelenkt werden.
    Additional Material: 6 Ill.
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  • 10
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit einem anisothermen Mischungskalorimeter, das auf dem Prinzip der thermometrischen Titration beruht, und einem Verdampfungskalorimeter, das nach der Inertgas-Durchströmungsmethode arbeitet und die isotherme differentielle Verdampfungswärme zu bestimmen gestattet, wurde das Enthalpie-Konzentrations-Diagramm (MOLLIER-PONCHON-Diagramm) des Systems Nitromethan/Wasser für 50° in einer für technische Zwecke ausreichenden Güte bestimmt. Die experimentellen Ergebnisse konnten mit theoretischen Voraussagen von SCHUBERTH [2] unter Verwendung des zweiseitigen PORTERschen Ansatzes, der für die Beschreibung des Phasengleichgewichtsverhaltens des genannten Systems eine gute Näherung darstellt [3], verglichen werden; die Übereinstimmung war im Rahmen des zu Erwartenden zufriedenstellend.
    Additional Material: 7 Ill.
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